Blue-red azo dye.



NITED STATES Patented April 18, 1905.

PATENT OFFIC PAUL JULIUS ANDQERNST FUSSENEGGER, OF LUDWIGSHAFEN-ON-THE-RHINE, GERMANY, ASSIGNORS TO BADISCHE ANILIN & SODA FABRIK,

OF LUDWVIGSHAFEN-ON-THE-RHINE, GERMANY,

BADEN.

A CORPORATION OF BLUE-RED AZO DYE.

SPECIFICATION forming part of Letters Patent No. 787,768, dated April18, 1905.

Application filed November 16 1904. Serial No. 233,027. (Specimensd Toall whom, it wtwy concern.-

Be it known that we, PAUL JULIUS and ERNST FUSSENEGGER, doctors ofphilosophy and chemists, subjects of the Emperor of Austria- Hungary,residing at Ludwigshafen-on-the- Rhine, in the Kingdom of Bavaria,German Empire, have invented new and useful Improvements in AzoColoring-Matter, of which the following is a specification.

This invention relates-to the production of azo coloring-matter.

We have discovered that a new and valuable azo coloring-matter, which inthe form of its lakes is characterized by excellent fastness against theaction of light, can be obtained by combining diazotized3.4-dichlor-anilin with beta-naphthol-disulfoacid R. The3..t-dichlor-anilin which is used in carrying out our invention can beobtained by'the method given by Beilstein and Kurbatow, (Annalen, 196,

The following example will serve to further illustrate the nature of ourinvention, which, however, is not confined to this example, (the partsbeing by weight:)

Diazotize one hundred and sixty-two (162) parts of 3.4-dichl0r-anilin inthe usual manner and allow the solution containing the easily-solublediazo compound to run (while stirring) into a solution of three hundredand fifty (350) parts of the sodium salt of betanaphthol-disulfo-acid R,adding sufficient so- As a new article of manufacture, the azocoloring-matter which can be obtained by combining diazotized3.4c-dichlor-anilin with betanaphthol-disulfo-acid R,whiohcoloring-matter is soluble in water, which in the form of itsbarium-aluminum lake possesses a bluishred color, and which on reductionwith tin and hydrochloric acid yields 3.4-dichlor-anilin andamido-naphthol-disulfo-acid.

In testimony whereof we have hereunto set our hands in the presence oftwo subscribing witnesses.

PAUL JULIUS. ERNST FUSSENEGGER.

Witnesses:

ERNEST F. EI-IRHARDT, -J. ALEo. LLOYD.

